MacBook a 1181 k36c no power no led magsafe

[inspirim]

This notebook does not turn, turns on only when it is held down the power button and inserting the connector magsafe with the fan running at full, the LED does not light magsafe, no green light, no light orange charging, replaced U7000 ISL6258 but without result, the voltage on the fuse F7000 good, good tension of 3,425 U6990
you have any idea
thanks to all

[ktmmotocross]

Re: MacBook a 1181 k36c no power no led magsafe

what is voltages on u6990 and on charger without starting

[inspirim]

Re: MacBook a 1181 k36c no power no led magsafe

3.38 volt output of U6990, the notebook starts normally with the battery but is not charging
thanks

[ktmmotocross]

Re: MacBook a 1181 k36c no power no led magsafe

but output must be 3.425

remove ic and inject 3.425 to see if charger lights up

[inspirim]

Re: MacBook a 1181 k36c no power no led magsafe

I tried removing ic given 3,425 volts but the charger does not light
thank you

[dellxps15]

Re: MacBook a 1181 k36c no power no led magsafe

pin voltage of u7000 ?

[inspirim]

Re: MacBook a 1181 k36c no power no led magsafe

thanks for the time that you're paying, on which pin of U7000 want to know the voltage?

[dellxps15]

Re: MacBook a 1181 k36c no power no led magsafe

all 28

[inspirim]

Re: MacBook a 1181 k36c no power no led magsafe

it is normal that the pin 14 AC CHGR_ACOK have zero volts?

[ktmmotocross]

Re: MacBook a 1181 k36c no power no led magsafe

ofcourse not. acok is charger signal that tells charger voltage is ok

[dellxps15]

Re: MacBook a 1181 k36c no power no led magsafe

it is normal that the pin 14 AC CHGR_ACOK have zero volts?

that voltage comes from smc.

check in your schematic for SMC_BC_ACOK and trace it . ull find a resistor. check voltage before and after. if needed replace resistor. if resistor is ok,check the onewire circuit. and try to see if SMC_BC_ACOK is ok here too. if not,... it's a smc problem. try reset smc by holding power botton 10 seconds (without any power source) and if tht doesnt work could be bad solder or smc need to be replaced.